Make sure Project:Build Automatically is turnedoff
Project:Clean
Make sure to select all projects
Make sure Start a Build Immediately isdisabled
Go to your workspace directory
Select everything (should be just folders)except the .metadata directory
Zip/7-zip all of the files into a single archive
Make sure to copy/email this file to yourself
Create New Workspace
At home, install and fire up Eclipse.
When prompted, create a new workspace directory
Restore Properties
In your new project, File:Import:General:Preferences
Browse to your properties backup file
Select it
Click Finish
Restore Projects
Unzip/7-zip your files into your newly-created workspace directory
Note, each of your projects will be a directory under your workspace directory
E.g. if your workspace directory is C:\workspaces\Ejb3AndJpa, then after extracting your projects you'll have folders like C:\workspaces\Ejb3AndJpa\Ejb3Tutorial1, C:\workspaces\Ejb3AndJpa\JpaTutorial1
Back in Eclipse, File:Import:General:Existing Projects
Browse to your workspace directory (should just need to click browse and OK)
Backup Properties
Backup Projects
Create New Workspace
Restore Properties
Restore Projects